I came in contact with a fast mover (1939 still) was a tanker at 12 knots.
For slow I'll reckon 6 or 7 knots depending on angle of approach. Medium I always pick 9. Then again I never lived past 1941, so I don't know bout the faster merchants.
tnx for the numbers am glad my nlind guessing of the speeds werent that far of.
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